Floor zero in cursive is written as ” “. It’s a time period used to explain the purpose of origin or the middle of a big occasion, usually one which has had a devastating impression.
The time period “floor zero” was first used within the context of nuclear explosions, referring to the purpose on the bottom immediately under the detonation. It has since been used to explain the start line of different main occasions, corresponding to pure disasters, terrorist assaults, and industrial accidents.